net/bridge/br_private.h

   1 /*
   2  *      Linux ethernet bridge
   3  *
   4  *      Authors:
   5  *      Lennert Buytenhek               <buytenh@gnu.org>
   6  *
   7  *      This program is free software; you can redistribute it and/or
   8  *      modify it under the terms of the GNU General Public License
   9  *      as published by the Free Software Foundation; either version
  10  *      2 of the License, or (at your option) any later version.
  11  */
  12
  13 #ifndef _BR_PRIVATE_H
  14 #define _BR_PRIVATE_H
  15
  16 #include <linux/netdevice.h>
  17 #include <linux/if_bridge.h>
  18 #include <linux/netpoll.h>
  19 #include <linux/u64_stats_sync.h>
  20 #include <net/route.h>
  21 #include <linux/if_vlan.h>
  22
  23 #define BR_HASH_BITS 8
  24 #define BR_HASH_SIZE (1 << BR_HASH_BITS)
  25
  26 #define BR_HOLD_TIME (1*HZ)
  27
  28 #define BR_PORT_BITS    10
  29 #define BR_MAX_PORTS    (1<<BR_PORT_BITS)
  30 #define BR_VLAN_BITMAP_LEN      BITS_TO_LONGS(VLAN_N_VID)
  31
  32 #define BR_VERSION      "2.3"
  33
  34 /* Control of forwarding link local multicast */
  35 #define BR_GROUPFWD_DEFAULT     0
  36 /* Don't allow forwarding control protocols like STP and LLDP */
  37 #define BR_GROUPFWD_RESTRICTED  0x4007u
  38 /* The Nearest Customer Bridge Group Address, 01-80-C2-00-00-[00,0B,0C,0D,0F] */
  39 #define BR_GROUPFWD_8021AD      0xB801u
  40
  41 /* Path to usermode spanning tree program */
  42 #define BR_STP_PROG     "/sbin/bridge-stp"
  43
  44 typedef struct bridge_id bridge_id;
  45 typedef struct mac_addr mac_addr;
  46 typedef __u16 port_id;
  47
  48 struct bridge_id
  49 {
  50         unsigned char   prio[2];
  51         unsigned char   addr[ETH_ALEN];
  52 };
  53
  54 struct mac_addr
  55 {
  56         unsigned char   addr[ETH_ALEN];
  57 };
  58
  59 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING
  60 /* our own querier */
  61 struct bridge_mcast_own_query {
  62         struct timer_list       timer;
  63         u32                     startup_sent;
  64 };
  65
  66 /* other querier */
  67 struct bridge_mcast_other_query {
  68         struct timer_list               timer;
  69         unsigned long                   delay_time;
  70 };
  71
  72 /* selected querier */
  73 struct bridge_mcast_querier {
  74         struct br_ip addr;
  75         struct net_bridge_port __rcu    *port;
  76 };
  77 #endif
  78
  79 struct net_port_vlans {
  80         u16                             port_idx;
  81         u16                             pvid;
  82         union {
  83                 struct net_bridge_port          *port;
  84                 struct net_bridge               *br;
  85         }                               parent;
  86         struct rcu_head                 rcu;
  87         unsigned long                   vlan_bitmap[BR_VLAN_BITMAP_LEN];
  88         unsigned long                   untagged_bitmap[BR_VLAN_BITMAP_LEN];
  89         u16                             num_vlans;
  90 };
  91
  92 struct net_bridge_fdb_entry
  93 {
  94         struct hlist_node               hlist;
  95         struct net_bridge_port          *dst;
  96
  97         struct rcu_head                 rcu;
  98         unsigned long                   updated;
  99         unsigned long                   used;
 100         mac_addr                        addr;
 101         unsigned char                   is_local;
 102         unsigned char                   is_static;
 103         unsigned char                   added_by_user;
 104         __u16                           vlan_id;
 105 };
 106
 107 struct net_bridge_port_group {
 108         struct net_bridge_port          *port;
 109         struct net_bridge_port_group __rcu *next;
 110         struct hlist_node               mglist;
 111         struct rcu_head                 rcu;
 112         struct timer_list               timer;
 113         struct br_ip                    addr;
 114         unsigned char                   state;
 115 };
 116
 117 struct net_bridge_mdb_entry
 118 {
 119         struct hlist_node               hlist[2];
 120         struct net_bridge               *br;
 121         struct net_bridge_port_group __rcu *ports;
 122         struct rcu_head                 rcu;
 123         struct timer_list               timer;
 124         struct br_ip                    addr;
 125         bool                            mglist;
 126 };
 127
 128 struct net_bridge_mdb_htable
 129 {
 130         struct hlist_head               *mhash;
 131         struct rcu_head                 rcu;
 132         struct net_bridge_mdb_htable    *old;
 133         u32                             size;
 134         u32                             max;
 135         u32                             secret;
 136         u32                             ver;
 137 };
 138
 139 struct net_bridge_port
 140 {
 141         struct net_bridge               *br;
 142         struct net_device               *dev;
 143         struct list_head                list;
 144
 145         /* STP */
 146         u8                              priority;
 147         u8                              state;
 148         u16                             port_no;
 149         unsigned char                   topology_change_ack;
 150         unsigned char                   config_pending;
 151         port_id                         port_id;
 152         port_id                         designated_port;
 153         bridge_id                       designated_root;
 154         bridge_id                       designated_bridge;
 155         u32                             path_cost;
 156         u32                             designated_cost;
 157         unsigned long                   designated_age;
 158
 159         struct timer_list               forward_delay_timer;
 160         struct timer_list               hold_timer;
 161         struct timer_list               message_age_timer;
 162         struct kobject                  kobj;
 163         struct rcu_head                 rcu;
 164
 165         unsigned long                   flags;
 166 #define BR_HAIRPIN_MODE         0x00000001
 167 #define BR_BPDU_GUARD           0x00000002
 168 #define BR_ROOT_BLOCK           0x00000004
 169 #define BR_MULTICAST_FAST_LEAVE 0x00000008
 170 #define BR_ADMIN_COST           0x00000010
 171 #define BR_LEARNING             0x00000020
 172 #define BR_FLOOD                0x00000040
 173 #define BR_AUTO_MASK (BR_FLOOD | BR_LEARNING)
 174 #define BR_PROMISC              0x00000080
 175
 176 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING
 177         struct bridge_mcast_own_query   ip4_own_query;
 178 #if IS_ENABLED(CONFIG_IPV6)
 179         struct bridge_mcast_own_query   ip6_own_query;
 180 #endif /* IS_ENABLED(CONFIG_IPV6) */
 181         unsigned char                   multicast_router;
 182         struct timer_list               multicast_router_timer;
 183         struct hlist_head               mglist;
 184         struct hlist_node               rlist;
 185 #endif
 186
 187 #ifdef CONFIG_SYSFS
 188         char                            sysfs_name[IFNAMSIZ];
 189 #endif
 190
 191 #ifdef CONFIG_NET_POLL_CONTROLLER
 192         struct netpoll                  *np;
 193 #endif
 194 #ifdef CONFIG_BRIDGE_VLAN_FILTERING
 195         struct net_port_vlans __rcu     *vlan_info;
 196 #endif
 197 };
 198
 199 #define br_auto_port(p) ((p)->flags & BR_AUTO_MASK)
 200 #define br_promisc_port(p) ((p)->flags & BR_PROMISC)
 201
 202 #define br_port_exists(dev) (dev->priv_flags & IFF_BRIDGE_PORT)
 203
 204 static inline struct net_bridge_port *br_port_get_rcu(const struct net_device *dev)
 205 {
 206         return rcu_dereference(dev->rx_handler_data);
 207 }
 208
 209 static inline struct net_bridge_port *br_port_get_rtnl(const struct net_device *dev)
 210 {
 211         return br_port_exists(dev) ?
 212                 rtnl_dereference(dev->rx_handler_data) : NULL;
 213 }
 214
 215 struct net_bridge
 216 {
 217         spinlock_t                      lock;
 218         struct list_head                port_list;
 219         struct net_device               *dev;
 220
 221         struct pcpu_sw_netstats         __percpu *stats;
 222         spinlock_t                      hash_lock;
 223         struct hlist_head               hash[BR_HASH_SIZE];
 224 #if IS_ENABLED(CONFIG_BRIDGE_NETFILTER)
 225         struct rtable                   fake_rtable;
 226         bool                            nf_call_iptables;
 227         bool                            nf_call_ip6tables;
 228         bool                            nf_call_arptables;
 229 #endif
 230         u16                             group_fwd_mask;
 231         u16                             group_fwd_mask_required;
 232
 233         /* STP */
 234         bridge_id                       designated_root;
 235         bridge_id                       bridge_id;
 236         u32                             root_path_cost;
 237         unsigned long                   max_age;
 238         unsigned long                   hello_time;
 239         unsigned long                   forward_delay;
 240         unsigned long                   bridge_max_age;
 241         unsigned long                   ageing_time;
 242         unsigned long                   bridge_hello_time;
 243         unsigned long                   bridge_forward_delay;
 244
 245         u8                              group_addr[ETH_ALEN];
 246         bool                            group_addr_set;
 247         u16                             root_port;
 248
 249         enum {
 250                 BR_NO_STP,              /* no spanning tree */
 251                 BR_KERNEL_STP,          /* old STP in kernel */
 252                 BR_USER_STP,            /* new RSTP in userspace */
 253         } stp_enabled;
 254
 255         unsigned char                   topology_change;
 256         unsigned char                   topology_change_detected;
 257
 258 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING
 259         unsigned char                   multicast_router;
 260
 261         u8                              multicast_disabled:1;
 262         u8                              multicast_querier:1;
 263         u8                              multicast_query_use_ifaddr:1;
 264
 265         u32                             hash_elasticity;
 266         u32                             hash_max;
 267
 268         u32                             multicast_last_member_count;
 269         u32                             multicast_startup_query_count;
 270
 271         unsigned long                   multicast_last_member_interval;
 272         unsigned long                   multicast_membership_interval;
 273         unsigned long                   multicast_querier_interval;
 274         unsigned long                   multicast_query_interval;
 275         unsigned long                   multicast_query_response_interval;
 276         unsigned long                   multicast_startup_query_interval;
 277
 278         spinlock_t                      multicast_lock;
 279         struct net_bridge_mdb_htable __rcu *mdb;
 280         struct hlist_head               router_list;
 281
 282         struct timer_list               multicast_router_timer;
 283         struct bridge_mcast_other_query ip4_other_query;
 284         struct bridge_mcast_own_query   ip4_own_query;
 285         struct bridge_mcast_querier     ip4_querier;
 286 #if IS_ENABLED(CONFIG_IPV6)
 287         struct bridge_mcast_other_query ip6_other_query;
 288         struct bridge_mcast_own_query   ip6_own_query;
 289         struct bridge_mcast_querier     ip6_querier;
 290 #endif /* IS_ENABLED(CONFIG_IPV6) */
 291 #endif
 292
 293         struct timer_list               hello_timer;
 294         struct timer_list               tcn_timer;
 295         struct timer_list               topology_change_timer;
 296         struct timer_list               gc_timer;
 297         struct kobject                  *ifobj;
 298         u32                             auto_cnt;
 299 #ifdef CONFIG_BRIDGE_VLAN_FILTERING
 300         u8                              vlan_enabled;
 301         __be16                          vlan_proto;
 302         u16                             default_pvid;
 303         struct net_port_vlans __rcu     *vlan_info;
 304 #endif
 305 };
 306
 307 struct br_input_skb_cb {
 308         struct net_device *brdev;
 309 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING
 310         int igmp;
 311         int mrouters_only;
 312 #endif
 313 #ifdef CONFIG_BRIDGE_VLAN_FILTERING
 314         bool vlan_filtered;
 315 #endif
 316 };
 317
 318 #define BR_INPUT_SKB_CB(__skb)  ((struct br_input_skb_cb *)(__skb)->cb)
 319
 320 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING
 321 # define BR_INPUT_SKB_CB_MROUTERS_ONLY(__skb)   (BR_INPUT_SKB_CB(__skb)->mrouters_only)
 322 #else
 323 # define BR_INPUT_SKB_CB_MROUTERS_ONLY(__skb)   (0)
 324 #endif
 325
 326 #define br_printk(level, br, format, args...)   \
 327         printk(level "%s: " format, (br)->dev->name, ##args)
 328
 329 #define br_err(__br, format, args...)                   \
 330         br_printk(KERN_ERR, __br, format, ##args)
 331 #define br_warn(__br, format, args...)                  \
 332         br_printk(KERN_WARNING, __br, format, ##args)
 333 #define br_notice(__br, format, args...)                \
 334         br_printk(KERN_NOTICE, __br, format, ##args)
 335 #define br_info(__br, format, args...)                  \
 336         br_printk(KERN_INFO, __br, format, ##args)
 337
 338 #define br_debug(br, format, args...)                   \
 339         pr_debug("%s: " format,  (br)->dev->name, ##args)
 340
 341 /* called under bridge lock */
 342 static inline int br_is_root_bridge(const struct net_bridge *br)
 343 {
 344         return !memcmp(&br->bridge_id, &br->designated_root, 8);
 345 }
 346
 347 /* br_device.c */
 348 void br_dev_setup(struct net_device *dev);
 349 void br_dev_delete(struct net_device *dev, struct list_head *list);
 350 netdev_tx_t br_dev_xmit(struct sk_buff *skb, struct net_device *dev);
 351 #ifdef CONFIG_NET_POLL_CONTROLLER
 352 static inline void br_netpoll_send_skb(const struct net_bridge_port *p,
 353                                        struct sk_buff *skb)
 354 {
 355         struct netpoll *np = p->np;
 356
 357         if (np)
 358                 netpoll_send_skb(np, skb);
 359 }
 360
 361 int br_netpoll_enable(struct net_bridge_port *p);
 362 void br_netpoll_disable(struct net_bridge_port *p);
 363 #else
 364 static inline void br_netpoll_send_skb(const struct net_bridge_port *p,
 365                                        struct sk_buff *skb)
 366 {
 367 }
 368
 369 static inline int br_netpoll_enable(struct net_bridge_port *p)
 370 {
 371         return 0;
 372 }
 373
 374 static inline void br_netpoll_disable(struct net_bridge_port *p)
 375 {
 376 }
 377 #endif
 378
 379 /* br_fdb.c */
 380 int br_fdb_init(void);
 381 void br_fdb_fini(void);
 382 void br_fdb_flush(struct net_bridge *br);
 383 void br_fdb_find_delete_local(struct net_bridge *br,
 384                               const struct net_bridge_port *p,
 385                               const unsigned char *addr, u16 vid);
 386 void br_fdb_changeaddr(struct net_bridge_port *p, const unsigned char *newaddr);
 387 void br_fdb_change_mac_address(struct net_bridge *br, const u8 *newaddr);
 388 void br_fdb_cleanup(unsigned long arg);
 389 void br_fdb_delete_by_port(struct net_bridge *br,
 390                            const struct net_bridge_port *p, int do_all);
 391 struct net_bridge_fdb_entry *__br_fdb_get(struct net_bridge *br,
 392                                           const unsigned char *addr, __u16 vid);
 393 int br_fdb_test_addr(struct net_device *dev, unsigned char *addr);
 394 int br_fdb_fillbuf(struct net_bridge *br, void *buf, unsigned long count,
 395                    unsigned long off);
 396 int br_fdb_insert(struct net_bridge *br, struct net_bridge_port *source,
 397                   const unsigned char *addr, u16 vid);
 398 void br_fdb_update(struct net_bridge *br, struct net_bridge_port *source,
 399                    const unsigned char *addr, u16 vid, bool added_by_user);
 400
 401 int br_fdb_delete(struct ndmsg *ndm, struct nlattr *tb[],
 402                   struct net_device *dev, const unsigned char *addr);
 403 int br_fdb_add(struct ndmsg *nlh, struct nlattr *tb[], struct net_device *dev,
 404                const unsigned char *addr, u16 nlh_flags);
 405 int br_fdb_dump(struct sk_buff *skb, struct netlink_callback *cb,
 406                 struct net_device *dev, struct net_device *fdev, int idx);
 407 int br_fdb_sync_static(struct net_bridge *br, struct net_bridge_port *p);
 408 void br_fdb_unsync_static(struct net_bridge *br, struct net_bridge_port *p);
 409
 410 /* br_forward.c */
 411 void br_deliver(const struct net_bridge_port *to, struct sk_buff *skb);
 412 int br_dev_queue_push_xmit(struct sk_buff *skb);
 413 void br_forward(const struct net_bridge_port *to,
 414                 struct sk_buff *skb, struct sk_buff *skb0);
 415 int br_forward_finish(struct sk_buff *skb);
 416 void br_flood_deliver(struct net_bridge *br, struct sk_buff *skb, bool unicast);
 417 void br_flood_forward(struct net_bridge *br, struct sk_buff *skb,
 418                       struct sk_buff *skb2, bool unicast);
 419
 420 /* br_if.c */
 421 void br_port_carrier_check(struct net_bridge_port *p);
 422 int br_add_bridge(struct net *net, const char *name);
 423 int br_del_bridge(struct net *net, const char *name);
 424 int br_add_if(struct net_bridge *br, struct net_device *dev);
 425 int br_del_if(struct net_bridge *br, struct net_device *dev);
 426 int br_min_mtu(const struct net_bridge *br);
 427 netdev_features_t br_features_recompute(struct net_bridge *br,
 428                                         netdev_features_t features);
 429 void br_port_flags_change(struct net_bridge_port *port, unsigned long mask);
 430 void br_manage_promisc(struct net_bridge *br);
 431
 432 /* br_input.c */
 433 int br_handle_frame_finish(struct sk_buff *skb);
 434 rx_handler_result_t br_handle_frame(struct sk_buff **pskb);
 435
 436 static inline bool br_rx_handler_check_rcu(const struct net_device *dev)
 437 {
 438         return rcu_dereference(dev->rx_handler) == br_handle_frame;
 439 }
 440
 441 static inline struct net_bridge_port *br_port_get_check_rcu(const struct net_device *dev)
 442 {
 443         return br_rx_handler_check_rcu(dev) ? br_port_get_rcu(dev) : NULL;
 444 }
 445
 446 /* br_ioctl.c */
 447 int br_dev_ioctl(struct net_device *dev, struct ifreq *rq, int cmd);
 448 int br_ioctl_deviceless_stub(struct net *net, unsigned int cmd,
 449                              void __user *arg);
 450
 451 /* br_multicast.c */
 452 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING
 453 extern unsigned int br_mdb_rehash_seq;
 454 int br_multicast_rcv(struct net_bridge *br, struct net_bridge_port *port,
 455                      struct sk_buff *skb, u16 vid);
 456 struct net_bridge_mdb_entry *br_mdb_get(struct net_bridge *br,
 457                                         struct sk_buff *skb, u16 vid);
 458 void br_multicast_add_port(struct net_bridge_port *port);
 459 void br_multicast_del_port(struct net_bridge_port *port);
 460 void br_multicast_enable_port(struct net_bridge_port *port);
 461 void br_multicast_disable_port(struct net_bridge_port *port);
 462 void br_multicast_init(struct net_bridge *br);
 463 void br_multicast_open(struct net_bridge *br);
 464 void br_multicast_stop(struct net_bridge *br);
 465 void br_multicast_deliver(struct net_bridge_mdb_entry *mdst,
 466                           struct sk_buff *skb);
 467 void br_multicast_forward(struct net_bridge_mdb_entry *mdst,
 468                           struct sk_buff *skb, struct sk_buff *skb2);
 469 int br_multicast_set_router(struct net_bridge *br, unsigned long val);
 470 int br_multicast_set_port_router(struct net_bridge_port *p, unsigned long val);
 471 int br_multicast_toggle(struct net_bridge *br, unsigned long val);
 472 int br_multicast_set_querier(struct net_bridge *br, unsigned long val);
 473 int br_multicast_set_hash_max(struct net_bridge *br, unsigned long val);
 474 struct net_bridge_mdb_entry *
 475 br_mdb_ip_get(struct net_bridge_mdb_htable *mdb, struct br_ip *dst);
 476 struct net_bridge_mdb_entry *
 477 br_multicast_new_group(struct net_bridge *br, struct net_bridge_port *port,
 478                        struct br_ip *group);
 479 void br_multicast_free_pg(struct rcu_head *head);
 480 struct net_bridge_port_group *
 481 br_multicast_new_port_group(struct net_bridge_port *port, struct br_ip *group,
 482                             struct net_bridge_port_group __rcu *next,
 483                             unsigned char state);
 484 void br_mdb_init(void);
 485 void br_mdb_uninit(void);
 486 void br_mdb_notify(struct net_device *dev, struct net_bridge_port *port,
 487                    struct br_ip *group, int type);
 488
 489 #define mlock_dereference(X, br) \
 490         rcu_dereference_protected(X, lockdep_is_held(&br->multicast_lock))
 491
 492 static inline bool br_multicast_is_router(struct net_bridge *br)
 493 {
 494         return br->multicast_router == 2 ||
 495                (br->multicast_router == 1 &&
 496                 timer_pending(&br->multicast_router_timer));
 497 }
 498
 499 static inline bool
 500 __br_multicast_querier_exists(struct net_bridge *br,
 501                               struct bridge_mcast_other_query *querier)
 502 {
 503         return time_is_before_jiffies(querier->delay_time) &&
 504                (br->multicast_querier || timer_pending(&querier->timer));
 505 }
 506
 507 static inline bool br_multicast_querier_exists(struct net_bridge *br,
 508                                                struct ethhdr *eth)
 509 {
 510         switch (eth->h_proto) {
 511         case (htons(ETH_P_IP)):
 512                 return __br_multicast_querier_exists(br, &br->ip4_other_query);
 513 #if IS_ENABLED(CONFIG_IPV6)
 514         case (htons(ETH_P_IPV6)):
 515                 return __br_multicast_querier_exists(br, &br->ip6_other_query);
 516 #endif
 517         default:
 518                 return false;
 519         }
 520 }
 521 #else
 522 static inline int br_multicast_rcv(struct net_bridge *br,
 523                                    struct net_bridge_port *port,
 524                                    struct sk_buff *skb,
 525                                    u16 vid)
 526 {
 527         return 0;
 528 }
 529
 530 static inline struct net_bridge_mdb_entry *br_mdb_get(struct net_bridge *br,
 531                                                       struct sk_buff *skb, u16 vid)
 532 {
 533         return NULL;
 534 }
 535
 536 static inline void br_multicast_add_port(struct net_bridge_port *port)
 537 {
 538 }
 539
 540 static inline void br_multicast_del_port(struct net_bridge_port *port)
 541 {
 542 }
 543
 544 static inline void br_multicast_enable_port(struct net_bridge_port *port)
 545 {
 546 }
 547
 548 static inline void br_multicast_disable_port(struct net_bridge_port *port)
 549 {
 550 }
 551
 552 static inline void br_multicast_init(struct net_bridge *br)
 553 {
 554 }
 555
 556 static inline void br_multicast_open(struct net_bridge *br)
 557 {
 558 }
 559
 560 static inline void br_multicast_stop(struct net_bridge *br)
 561 {
 562 }
 563
 564 static inline void br_multicast_deliver(struct net_bridge_mdb_entry *mdst,
 565                                         struct sk_buff *skb)
 566 {
 567 }
 568
 569 static inline void br_multicast_forward(struct net_bridge_mdb_entry *mdst,
 570                                         struct sk_buff *skb,
 571                                         struct sk_buff *skb2)
 572 {
 573 }
 574 static inline bool br_multicast_is_router(struct net_bridge *br)
 575 {
 576         return 0;
 577 }
 578 static inline bool br_multicast_querier_exists(struct net_bridge *br,
 579                                                struct ethhdr *eth)
 580 {
 581         return false;
 582 }
 583 static inline void br_mdb_init(void)
 584 {
 585 }
 586 static inline void br_mdb_uninit(void)
 587 {
 588 }
 589 #endif
 590
 591 /* br_vlan.c */
 592 #ifdef CONFIG_BRIDGE_VLAN_FILTERING
 593 bool br_allowed_ingress(struct net_bridge *br, struct net_port_vlans *v,
 594                         struct sk_buff *skb, u16 *vid);
 595 bool br_allowed_egress(struct net_bridge *br, const struct net_port_vlans *v,
 596                        const struct sk_buff *skb);
 597 bool br_should_learn(struct net_bridge_port *p, struct sk_buff *skb, u16 *vid);
 598 struct sk_buff *br_handle_vlan(struct net_bridge *br,
 599                                const struct net_port_vlans *v,
 600                                struct sk_buff *skb);
 601 int br_vlan_add(struct net_bridge *br, u16 vid, u16 flags);
 602 int br_vlan_delete(struct net_bridge *br, u16 vid);
 603 void br_vlan_flush(struct net_bridge *br);
 604 bool br_vlan_find(struct net_bridge *br, u16 vid);
 605 void br_recalculate_fwd_mask(struct net_bridge *br);
 606 int br_vlan_filter_toggle(struct net_bridge *br, unsigned long val);
 607 int br_vlan_set_proto(struct net_bridge *br, unsigned long val);
 608 void br_vlan_init(struct net_bridge *br);
 609 int br_vlan_set_default_pvid(struct net_bridge *br, unsigned long val);
 610 int nbp_vlan_add(struct net_bridge_port *port, u16 vid, u16 flags);
 611 int nbp_vlan_delete(struct net_bridge_port *port, u16 vid);
 612 void nbp_vlan_flush(struct net_bridge_port *port);
 613 bool nbp_vlan_find(struct net_bridge_port *port, u16 vid);
 614
 615 static inline struct net_port_vlans *br_get_vlan_info(
 616                                                 const struct net_bridge *br)
 617 {
 618         return rcu_dereference_rtnl(br->vlan_info);
 619 }
 620
 621 static inline struct net_port_vlans *nbp_get_vlan_info(
 622                                                 const struct net_bridge_port *p)
 623 {
 624         return rcu_dereference_rtnl(p->vlan_info);
 625 }
 626
 627 /* Since bridge now depends on 8021Q module, but the time bridge sees the
 628  * skb, the vlan tag will always be present if the frame was tagged.
 629  */
 630 static inline int br_vlan_get_tag(const struct sk_buff *skb, u16 *vid)
 631 {
 632         int err = 0;
 633
 634         if (vlan_tx_tag_present(skb))
 635                 *vid = vlan_tx_tag_get(skb) & VLAN_VID_MASK;
 636         else {
 637                 *vid = 0;
 638                 err = -EINVAL;
 639         }
 640
 641         return err;
 642 }
 643
 644 static inline u16 br_get_pvid(const struct net_port_vlans *v)
 645 {
 646         /* Return just the VID if it is set, or VLAN_N_VID (invalid vid) if
 647          * vid wasn't set
 648          */
 649         smp_rmb();
 650         return v->pvid ?: VLAN_N_VID;
 651 }
 652
 653 static inline int br_vlan_enabled(struct net_bridge *br)
 654 {
 655         return br->vlan_enabled;
 656 }
 657 #else
 658 static inline bool br_allowed_ingress(struct net_bridge *br,
 659                                       struct net_port_vlans *v,
 660                                       struct sk_buff *skb,
 661                                       u16 *vid)
 662 {
 663         return true;
 664 }
 665
 666 static inline bool br_allowed_egress(struct net_bridge *br,
 667                                      const struct net_port_vlans *v,
 668                                      const struct sk_buff *skb)
 669 {
 670         return true;
 671 }
 672
 673 static inline bool br_should_learn(struct net_bridge_port *p,
 674                                    struct sk_buff *skb, u16 *vid)
 675 {
 676         return true;
 677 }
 678
 679 static inline struct sk_buff *br_handle_vlan(struct net_bridge *br,
 680                                              const struct net_port_vlans *v,
 681                                              struct sk_buff *skb)
 682 {
 683         return skb;
 684 }
 685
 686 static inline int br_vlan_add(struct net_bridge *br, u16 vid, u16 flags)
 687 {
 688         return -EOPNOTSUPP;
 689 }
 690
 691 static inline int br_vlan_delete(struct net_bridge *br, u16 vid)
 692 {
 693         return -EOPNOTSUPP;
 694 }
 695
 696 static inline void br_vlan_flush(struct net_bridge *br)
 697 {
 698 }
 699
 700 static inline bool br_vlan_find(struct net_bridge *br, u16 vid)
 701 {
 702         return false;
 703 }
 704
 705 static inline void br_recalculate_fwd_mask(struct net_bridge *br)
 706 {
 707 }
 708
 709 static inline void br_vlan_init(struct net_bridge *br)
 710 {
 711 }
 712
 713 static inline int nbp_vlan_add(struct net_bridge_port *port, u16 vid, u16 flags)
 714 {
 715         return -EOPNOTSUPP;
 716 }
 717
 718 static inline int nbp_vlan_delete(struct net_bridge_port *port, u16 vid)
 719 {
 720         return -EOPNOTSUPP;
 721 }
 722
 723 static inline void nbp_vlan_flush(struct net_bridge_port *port)
 724 {
 725 }
 726
 727 static inline struct net_port_vlans *br_get_vlan_info(
 728                                                 const struct net_bridge *br)
 729 {
 730         return NULL;
 731 }
 732 static inline struct net_port_vlans *nbp_get_vlan_info(
 733                                                 const struct net_bridge_port *p)
 734 {
 735         return NULL;
 736 }
 737
 738 static inline bool nbp_vlan_find(struct net_bridge_port *port, u16 vid)
 739 {
 740         return false;
 741 }
 742
 743 static inline u16 br_vlan_get_tag(const struct sk_buff *skb, u16 *tag)
 744 {
 745         return 0;
 746 }
 747 static inline u16 br_get_pvid(const struct net_port_vlans *v)
 748 {
 749         return VLAN_N_VID;      /* Returns invalid vid */
 750 }
 751
 752 static inline int br_vlan_enabled(struct net_bridge *br)
 753 {
 754         return 0;
 755 }
 756 #endif
 757
 758 /* br_netfilter.c */
 759 #if IS_ENABLED(CONFIG_BRIDGE_NETFILTER)
 760 int br_nf_core_init(void);
 761 void br_nf_core_fini(void);
 762 void br_netfilter_rtable_init(struct net_bridge *);
 763 #else
 764 static inline int br_nf_core_init(void) { return 0; }
 765 static inline void br_nf_core_fini(void) {}
 766 #define br_netfilter_rtable_init(x)
 767 #endif
 768
 769 /* br_stp.c */
 770 void br_log_state(const struct net_bridge_port *p);
 771 void br_set_state(struct net_bridge_port *p, unsigned int state);
 772 struct net_bridge_port *br_get_port(struct net_bridge *br, u16 port_no);
 773 void br_init_port(struct net_bridge_port *p);
 774 void br_become_designated_port(struct net_bridge_port *p);
 775
 776 void __br_set_forward_delay(struct net_bridge *br, unsigned long t);
 777 int br_set_forward_delay(struct net_bridge *br, unsigned long x);
 778 int br_set_hello_time(struct net_bridge *br, unsigned long x);
 779 int br_set_max_age(struct net_bridge *br, unsigned long x);
 780
 781
 782 /* br_stp_if.c */
 783 void br_stp_enable_bridge(struct net_bridge *br);
 784 void br_stp_disable_bridge(struct net_bridge *br);
 785 void br_stp_set_enabled(struct net_bridge *br, unsigned long val);
 786 void br_stp_enable_port(struct net_bridge_port *p);
 787 void br_stp_disable_port(struct net_bridge_port *p);
 788 bool br_stp_recalculate_bridge_id(struct net_bridge *br);
 789 void br_stp_change_bridge_id(struct net_bridge *br, const unsigned char *a);
 790 void br_stp_set_bridge_priority(struct net_bridge *br, u16 newprio);
 791 int br_stp_set_port_priority(struct net_bridge_port *p, unsigned long newprio);
 792 int br_stp_set_path_cost(struct net_bridge_port *p, unsigned long path_cost);
 793 ssize_t br_show_bridge_id(char *buf, const struct bridge_id *id);
 794
 795 /* br_stp_bpdu.c */
 796 struct stp_proto;
 797 void br_stp_rcv(const struct stp_proto *proto, struct sk_buff *skb,
 798                 struct net_device *dev);
 799
 800 /* br_stp_timer.c */
 801 void br_stp_timer_init(struct net_bridge *br);
 802 void br_stp_port_timer_init(struct net_bridge_port *p);
 803 unsigned long br_timer_value(const struct timer_list *timer);
 804
 805 /* br.c */
 806 #if IS_ENABLED(CONFIG_ATM_LANE)
 807 extern int (*br_fdb_test_addr_hook)(struct net_device *dev, unsigned char *addr);
 808 #endif
 809
 810 /* br_netlink.c */
 811 extern struct rtnl_link_ops br_link_ops;
 812 int br_netlink_init(void);
 813 void br_netlink_fini(void);
 814 void br_ifinfo_notify(int event, struct net_bridge_port *port);
 815 int br_setlink(struct net_device *dev, struct nlmsghdr *nlmsg);
 816 int br_dellink(struct net_device *dev, struct nlmsghdr *nlmsg);
 817 int br_getlink(struct sk_buff *skb, u32 pid, u32 seq, struct net_device *dev,
 818                u32 filter_mask);
 819
 820 #ifdef CONFIG_SYSFS
 821 /* br_sysfs_if.c */
 822 extern const struct sysfs_ops brport_sysfs_ops;
 823 int br_sysfs_addif(struct net_bridge_port *p);
 824 int br_sysfs_renameif(struct net_bridge_port *p);
 825
 826 /* br_sysfs_br.c */
 827 int br_sysfs_addbr(struct net_device *dev);
 828 void br_sysfs_delbr(struct net_device *dev);
 829
 830 #else
 831
 832 static inline int br_sysfs_addif(struct net_bridge_port *p) { return 0; }
 833 static inline int br_sysfs_renameif(struct net_bridge_port *p) { return 0; }
 834 static inline int br_sysfs_addbr(struct net_device *dev) { return 0; }
 835 static inline void br_sysfs_delbr(struct net_device *dev) { return; }
 836 #endif /* CONFIG_SYSFS */
 837
 838 #endif